kb.c File Reference

#include "../lib/types.h"
#include "kb.h"
#include "io.h"

Include dependency graph for kb.c:

Go to the source code of this file.

Functions
uint8_t	__scntasci (uint8_t inpt, uint8_t shifted)
	scntasci converts a keyboard scancode to an ascii character
uint8_t	__gtchr (void)
	listens for a character outside of loops from ports
void	__kbstate (uint8_t *shift, uint8_t *caps)
	kbstate exports the current keyboard modifier state
void	__kbreset (void)
	kbreset resets the keyboard modifier states

Variables
static uint8_t	shift_pressed = 0
static uint8_t	caps_lock = 0

Function Documentation

__gtchr()

uint8_t __gtchr

(

void

)

listens for a character outside of loops from ports

gtchr is a function that directly gets a key pressed from outside of rdln or loops

use of gtchr is done with

#include "../io/kb.h" //or just kb.h
uint8_t key = gtchr(); //also often times in a while(1) loop
if (key == 'e') { do something };

See also

rdln()

Definition at line 109 of file kb.c.

References caps_lock, inb, scntasci, and shift_pressed.

__kbreset()

void __kbreset

(

void

)

kbreset resets the keyboard modifier states

kbreset is a function that clears the shift and caps lock states back to their defaults (both off)

using kbreset is done with

#include "../io/kb.h" //or just kb.h
kbreset();

See also

kbstate(), gtchr()

Definition at line 203 of file kb.c.

References caps_lock, and shift_pressed.

__kbstate()

void __kbstate	(	uint8_t *	shift,
		uint8_t *	caps )

kbstate exports the current keyboard modifier state

kbstate is a function that writes the current shift and caps lock states into the provided pointers

Parameters

shift,a	pointer to store the shift state (1 = pressed)
caps,a	pointer to store the caps lock state (1 = enabled)

using kbstate is done with

#include "../io/kb.h" //or just kb.h
uint8_t shift, caps;
kbstate(&shift, &caps);

See also

kbreset(), gtchr()

Definition at line 184 of file kb.c.

References caps_lock, and shift_pressed.

__scntasci()

uint8_t __scntasci	(	uint8_t	inpt,
		uint8_t	shifted )

scntasci converts a keyboard scancode to an ascii character

scntasci is a function that translates ps/2 scancodes into ascii characters, applying shift and caps lock state for proper casing

Parameters

inpt,the	raw scancode byte from the keyboard
shifted,whether	shift is currently pressed (1) or not (0)

using scntasci is done with

#include "../io/kb.h" //or just kb.h
uint8_t scancode = inb(0x60);
uint8_t ascii = scntasci(scancode, 0); //convert without shift

See also

gtchr(), kbstate()

Definition at line 26 of file kb.c.

References caps_lock.

Variable Documentation

caps_lock

uint8_t caps_lock = 0

static

Definition at line 7 of file kb.c.

Referenced by __gtchr(), __kbreset(), __kbstate(), and __scntasci().

shift_pressed

uint8_t shift_pressed = 0

static

Definition at line 6 of file kb.c.

Referenced by __gtchr(), __kbreset(), and __kbstate().